diff options
| author | Miklos Szeredi <mszeredi@suse.cz> | 2007-10-18 14:07:00 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-19 01:37:30 +0400 |
| commit | d139d7ffd0c1e81e2a809909b4f8b121a0dc119a (patch) | |
| tree | e8c9dd746bfd8ae16d17596009608c4c1a153217 | |
| parent | 49d4914fd7c10ae846d0f30d5f6f4732cc68499c (diff) | |
| download | linux-d139d7ffd0c1e81e2a809909b4f8b121a0dc119a.tar.xz | |
VFS: allow filesystems to implement atomic open+truncate
Add a new attribute flag ATTR_OPEN, with the meaning: "truncation was
initiated by open() due to the O_TRUNC flag".
This way filesystems wanting to implement truncation within their ->open()
method can ignore such truncate requests.
This is a quick & dirty hack, but it comes for free.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/namei.c | 6 | ||||
| -rw-r--r-- | include/linux/fs.h | 1 |
2 files changed, 5 insertions, 2 deletions
diff --git a/fs/namei.c b/fs/namei.c index 464eeccb675b..1e5c71669164 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1659,8 +1659,10 @@ int may_open(struct nameidata *nd, int acc_mode, int flag) error = locks_verify_locked(inode); if (!error) { DQUOT_INIT(inode); - - error = do_truncate(dentry, 0, ATTR_MTIME|ATTR_CTIME, NULL); + + error = do_truncate(dentry, 0, + ATTR_MTIME|ATTR_CTIME|ATTR_OPEN, + NULL); } put_write_access(inode); if (error) diff --git a/include/linux/fs.h b/include/linux/fs.h index e3fc5dbb2246..6a4d170ad9a5 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -330,6 +330,7 @@ typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, #define ATTR_KILL_SGID 4096 #define ATTR_FILE 8192 #define ATTR_KILL_PRIV 16384 +#define ATTR_OPEN 32768 /* Truncating from open(O_TRUNC) */ /* * This is the Inode Attributes structure, used for notify_change(). It |